Notice: Undefined variable: _SESSION in D:\Apache24\htdocs\wechat\php\khyy.php on line 11

Fatal error: Uncaught Error: Call to undefined function pdo_fetch() in D:\Apache24\htdocs\wechat\php\khyy.php:13 Stack trace: #0 {main} thrown in D:\Apache24\htdocs\wechat\php\khyy.php on line 13